/**
 * Copyright © 2023-2030 The ruanrongman Authors
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package top.rslly.iot.utility.script;

public class RuleNodeScriptFactory {

  public static final String MSG = "msg";
  public static final String METADATA = "metadata";
  public static final String MSG_TYPE = "msgType";
  public static final String RULE_NODE_FUNCTION_NAME = "ruleNodeFunc";

  private static final String JS_WRAPPER_PREFIX_TEMPLATE =
      "function %s(msgStr, metadataStr, msgType) { " +
          "    var msg = JSON.parse(msgStr); " +
          "    var metadata = JSON.parse(metadataStr); " +
          "    return JSON.stringify(%s(msg, metadata, msgType));" +
          "    function %s(%s, %s, %s) {";
  private static final String JS_WRAPPER_SUFFIX = "\n}" +
      "\n}";


  public static String generateRuleNodeScript(String functionName, String scriptBody,
      String... argNames) {
    String msgArg;
    String metadataArg;
    String msgTypeArg;
    if (argNames != null && argNames.length == 3) {
      msgArg = argNames[0];
      metadataArg = argNames[1];
      msgTypeArg = argNames[2];
    } else {
      msgArg = MSG;
      metadataArg = METADATA;
      msgTypeArg = MSG_TYPE;
    }
    String jsWrapperPrefix = String.format(JS_WRAPPER_PREFIX_TEMPLATE, functionName,
        RULE_NODE_FUNCTION_NAME, RULE_NODE_FUNCTION_NAME, msgArg, metadataArg, msgTypeArg);
    return jsWrapperPrefix + scriptBody + JS_WRAPPER_SUFFIX;
  }

}
